Roller for watches.



J. SGHOOP.

ROLLER FOR WATCHES.

APPLIOATION TILED AUG.14, 1907.

901,487. Patented 0cl .20,1908.

WITNESSES: INVENTOR.

ATTORNEYZ UNITED STATES PATENT @FFICE.

JOSEPH SOHOOP, OF SPRINGFIELD, WISCONSIN.

ROLLER FOR WATCHES.

To all whom it may concern:

Be it known that I, JOSEPH SoHoor, a citizen of the United States, residing in the town of Springfield, county of Dane, and State of Wisconsin, and whose post-office ad dress is Middleton, Dane county, Wisconsin, have. invented a new and useful Improvement in Rollers for the Escapement of Vatches, of which the following is a speci fication.

My invention relates to improvements in rollers in what is known as the escapement of watches in which the jewel on which the fork operates to actuate the balance wheel is fastened by my improved method.

The objects of my improvements are to provide a roller for watches in which the jewel can be effectually and satisfactorily fastened without the use of cement or cementing substances and to provide a roller which can be readily repaired by the replacement of a jewel by any watch maker. I at tain these objects by the device illustrated in the accompanying drawing, in which,

Figure I. is a view of the face of the roller with jewel and fastener removed. Fig. II. is a view of the ring which effects the fasteningremoved from the roller. Fig. III is a view of the face of the roller with the jewel in place showing the fastening device.

Similar figures refer to similar parts througout the several views.

The improvement consists in a circular groove so cut intothe face of the roller on which the jewel projects that the groove extends partly across the hole in the roller into which the jewel is inserted or fastened. This groove is, either unthreaded, or, on the wall nearer the center of the roller, threaded to receive the threads of the ring which is to be inserted therein. Into this groove is inserted the ring of the same size as the groove made to fit securely therein, this ring being either threaded on its inner wall or unthreaded so that when it is placed into the groove and the largest portion of the notch on its outer wall is opposite the opening in the roller, which receives the jewel, the jewel, may be inserted and then the ring by means of a tool may be turned in the groove so that the outer rim of the ring will wedge itself against the jewel thereby effectually binding it into position without the use of cement or shellac.

Specification of Letters Patent.

Application filed August 14, 1907.

Patented Oct. 20, 1908.

Serial No. 388,480.

In the drawings 1, Fig. I and Fig. III is the roller of the watch provided at 2 with the customary shaft and at 3 (Fig. III) with the customary jewel set at 3 (Fig. I) in the cus tomary jewel hole. The roller is also provided at 4, Fig. I with a circular groove sunk into the face of the roller from which face the jewel projects; this groove may be either threaded on its wall nearer the center of the roller at 6, or left without threads; 5 is a ring of the same size as the groove 4 in the roller and made to fit tightly therein. This ring may be either threaded on its inner wall at 6 or not threaded according as the groove 4 is threaded or not; this ring is notched at 5 the notch commencing at the outer edge of the ring and increasing gradually to a depth nearly equal to the diameter of the jewel 3; this ring is also provided with proper notches or recesses 77 on its exterior face to receive screw driver for setting the ring in place. I

The jewel on the roller of a watch is ordinarily set in a hole in the roller and fastened by cement or shellac; with the device above set forth the jewel is set in the hole 3 in the roller 1, the hole overlapping partly the groove 4; then instead of cementing the jewel the ring 5 is placed in the groove 4 so that the jewel 3 is received at the largest depth of the notch 5. Then by means of a tool the ring is revolved in the groove so that the decreasing depth of the notch 5 brings the outer rim of the ring 5 in closer and closer contact with the jewel 3 thereby effectually wedging the ewel in position.

That I claim and seek to secure by Letters Patent is,

1. A roller having a circular groove in its face, a transverse ewel hole extending into a part of said groove, combined with a ring adapted to seat in said groove, and provided with means to secure a jewel in the jewel hole.

2. A roller having a depression in its face, a transverse jewel hole a portion of which extends into said depression, combined with means for securing a jewel in the jewel hole adapted to seat in the depression.

3. A roller having a circular groove in its face and a jewel hole a portion of whicheX- tends into said groove, combined with a ring to fit in said groove and provided with a cam notch in its periphery for engagement with and l:'1"u'ti011:11] securing :1 jewel in the jewel engage the 021m note]! with H10 jewel in H113 hole. ewel hole.

4. The (eombum'blon w1th a grooved roller,

' 'Yw *"1\ l"') of :1 ring having a cum notch in its periph- 'rObhl n hQHU ery, a jewel hole provided with a curved Witnesses: wall Winch extends mto 52nd groove, and ALICE GALLAGHER,

means for turnin said rin t0 frictionzdlv EMERSON Em. 

